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Variable Interest Entities - Consolidated VIEs (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Carrying amounts of consolidated VIE assets and liabilities |  |  |  |
Total assets | $ 313,663.6 | $ 305,046.7 |  |
Total liabilities | 302,194.6 | 293,836.1 |  |
Redeemable noncontrolling interest | 337.7 | 248.9 | $ 262.0 | $ 332.5
Aggregate consolidated variable interest entities |  |  |  |
Carrying amounts of consolidated VIE assets and liabilities |  |  |  |
Total assets | 35,834.9 | 37,511.3 |  |
Total liabilities | 33,051.8 | 34,778.5 |  |
Redeemable noncontrolling interest | 309.9 | 226.4 |  |
Mandatory retirement savings funds |  |  |  |
Carrying amounts of consolidated VIE assets and liabilities |  |  |  |
Total assets | 33,130.4 | 35,034.4 |  |
Total liabilities | 32,802.2 | 34,688.3 |  |
Real estate VIE |  |  |  |
Carrying amounts of consolidated VIE assets and liabilities |  |  |  |
Total assets | 814.3 | 829.1 |  |
Total liabilities | 69.4 | 63.0 |  |
Sponsored investment funds |  |  |  |
Carrying amounts of consolidated VIE assets and liabilities |  |  |  |
Total assets | 833.7 | 523.8 |  |
Total liabilities | 160.3 | 6.3 |  |
Redeemable noncontrolling interest | 309.9 | 226.4 |  |
Residential mortgage loans VIE |  |  |  |
Carrying amounts of consolidated VIE assets and liabilities |  |  |  |
Total assets | 806.5 | 874.7 |  |
Total liabilities | 19.9 | 20.9 |  |
Asset-backed limited partnership |  |  |  |
Carrying amounts of consolidated VIE assets and liabilities |  |  |  |
Total assets | $ 250.0 | $ 249.3 |  |

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